Malicious PDF — malware analysis report

Static analysis result for SHA-256 9396b8cdf22e5848…

MALICIOUS

PDF

128.5 KB Created: 2021-03-23 05:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74d98a0b388d0d06db61210a3fba1fd3 SHA-1: d24832c447377fe85a9f5261a1e4a2875b4e7cd6 SHA-256: 9396b8cdf22e5848d0403a0a74af2fe60ed18114fd7ffcad91271d9533472e73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs suggests the PDF is designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=baixar+livros+esp%25C3%25ADritas+gr%25C3%25A1tis+para+android
    • http://werenntaq.online/nisuwesakupudunivatefefenou313.pdf
    • http://emirofficialzm.com/what_does_indian_sandalwood_smell_likew8fo1.pdf
    • http://potuxoposutu.medianewsonline.com/71894917032.pdf
    • http://tapasin.sportsontheweb.net/vapewuf.pdf
    • https://cdn.sqhk.co/fexilejedit/vSgcoyo/build_roads_federal_or_state.pdf
    • http://reactivaperu-2020.com/a_song_of_ice_and_fire_book_1_wiki4ew76.pdf
    • http://sakulog.sportsontheweb.net/fetotivevexotusaw.pdf
    • http://wugupomovupa.sportsontheweb.net/nikon_d5600_dslr_camera_uk.pdf
    • http://center-about.com/30696597403sozv6.pdf
    • https://cdn.sqhk.co/naludibeg/gjbPgde/cancer_colo_de_utero.pdf
    • http://govuxojikasumot.scienceontheweb.net/75433052252.pdf
    • http://tixesikixux.mygamesonline.org/20891453953.pdf
    • http://metoxegid.mygamesonline.org/speaking_skills_in_english.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_7a2dcea73f3b4f49855b43cfc299afaf.pdf?index=true
    • http://liraperuwuw.atwebpages.com/39054536523.pdf
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_892ccb73d47d414ebcb237cd936ed8b1.pdf?index=true
    • https://s3.amazonaws.com/nonabafat/kumon_answer_book_level_dll_reading.pdf
    • https://s3.amazonaws.com/kuboki/chiari_malformation_ribbon.pdf
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_16e144df8bd949e68bdf2f7e2d27b797.pdf?index=true
    • https://s3.amazonaws.com/bezorito/best_spin_bike_for_home_with_virtual_screen.pdf
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_6736aefb4b5943e9a140d377daa051ce.pdf?index=true
    • https://s3.amazonaws.com/nonabafat/26389994109.pdf
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_3a74a51af5e544c2a947ad83da2f22f8.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b396.bin
f2c2fc71c809ee3741cbe11eef854e5b5be1c16f4b2bb190f55bc917818362a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B396 5592 bytes
font_01_sfnt_off0001c620.bin
43a33561b5e6cec9172ec83bc7b840f4256ba01216397f2fcae9ac7710c091d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C620 14788 bytes

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